I recently added the VGA connection to my DC. Everything seems to work except the picture comes out Black & White! Any ideas? I've checked for continuity between all the pins and MOBO. Sound works and the picture shows up. I'm lost as to where to start troubleshooting this issue.

The problem is most likely with the RGB pins (or at least that's the only sensible place for it to be). Did you wire the capacitors up properly between the Dreamcast and the VGA connector? I'm pretty sure they won't work right if you get the polarity reversed, being that you should be using electrolytic capacitors for them.

Note, I've never done this particular mod, so I'm basically just taking a stab in the dark here.

Are you using a tv or a vga monitor?I did this circuit once and it worked as it should on a pc monitor. If I remember well, in vga mode the signal is progressive.I think the only time I had black and white was when I connected ntsc composite video on a pal tv (it's been almost 10 years)

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